Custer Feldspar (post-2000)
Alternate Names: Custer - low KnO
| Oxide | Analysis | Formula | Tolerance |
|---|---|---|---|
| SiO2 | 72.40% | 8.63 | |
| Al2O3 | 15.27% | 1.07 | |
| Fe2O3 | 0.21% | 0.01 | |
| K2O | 7.52% | 0.57 | |
| Na2O | 3.21% | 0.37 | |
| CaO | 0.27% | 0.03 | |
| MgO | 0.07% | 0.01 | |
| P2O5 | 0.20% | 0.01 | |
| LOI | 0.65% | n/a | |
| Oxide Weight | 710.43 | ||
| Formula Weight | 715.08 | ||
Notes
This is an average of actual assays done. See the notes for Custer Feldspar (pre-2000) for more info.
Related Information
Custer Feldspar update
This picture has its own page with more detail, click here to see it.
The chemistry for Custer Feldspar has been updated in the materials at Digitalfire and Insight-live. Until now, the Pacer-published values have been used, but at Ron Roy's request, this has been changed (see the link to his article below). The average of assays done from 2000 to 2012 has been used for the chemistry. The material name has been changed to "Custer Feldspar (post-2000)". However, Insight-live will still find it in recipes when needing its chemistry, since "Custer Feldspar" has been included as an alternate name. The old material's name has been changed to "Custer Feldspar (pre-2000)".
In this image, you can see the material chemistries on the right and each of them being used in a one-material recipe on the left. To verify they are calculating correctly, the calculation of each has been set to formula plus analysis.
If you have defined your own material for this (typically done to set a cost), everything should still work correctly (using your chemistry if you provided it).
Links
| Materials |
Custer Feldspar (pre-2000)
The most common potash feldspar used in ceramics in North America. It was a standard for many decades but is no longer available. |
| URLs |
https://www.ronroy.net/analyses/custer-article-.pdf
Ron Roy article about changes in Custer Feldspar |
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